H. Elkamchouchi¹, Heba G. Mohamed², Fatma Ahmed¹ and Dalia H. ElKamchouchi¹,
¹Alexandria University, Egypt and ²Arab Academy for Science and Technology (AAST), Egypt

Proxy signature scheme permits an original signer to delegate his/her signing capability to a proxy signer and then the proxy signer generates a signing message on behalf of the original signer. So far, the proxy signature scheme is only applied in a special duration, when the original signer is not in his office or when he travels outside. The two parties must be able to authenticate one another and agree on a secret encryption key, in order to communicate securely over an unreliable public network. Authenticated key agreement protocols have an important role in building a secure communications network between the two parties. In this paper, we propose a secure proxy signature scheme over an efficient and secure authenticated key agreement protocol based on RSA cryptosystem.

Digital Signature, Proxy Signature, RSA, Key Agreement